Congrats!
These are supposed to be best of the soviet orthos along with the tds-7(that's what the russians say at least!).
The housing is almost identical to yamaha HP-1(of which it is supposed to be a clone) but the driver is more like a PMB one.
My own pair came modded so I can only guess how a stock pair would sound. It shouldn't be unlistenable like a lot of vintage orthos since these don't seem to need much damping. You would need some good sealing replacement pads though.
@shipsupt : ya, the modding potential is great. I transplanted these drivers into a PMB80 shell & it sounds really nice.It clearly held its own against the modern orthos in the last meet we had.